<template>
  <div class="app-container">
    <h2 style="text-align: center;">发布新课程</h2>
    <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="编辑课程基本信息"/>
      <el-step title="编辑课程大纲"/>
      <el-step title="发布课程"/>
    </el-steps>

    <el-button type="text" @click="openChapterDialog()">添加章节</el-button>
    <!-- 章节 -->
    <ul class="chanpterList">
      <li v-for="chapter in chapterVideoList" :key="chapter.id">
        <p>
          {{ chapter.title }}
          <span class="acts">
            <el-button type="text" @click="openVideo(chapter.id)">添加课时</el-button>
            <el-button style="" type="text" @click="openEditChapter(chapter.id)">修改</el-button>
            <el-button type="text" @click="deleteChapter(chapter.id)">删除</el-button>
          </span>
        </p>
            <!-- 视频 -->
            <ul class="chanpterList videoList">
                <li
                    v-for="video in chapter.children"
                    :key="video.id">
                    <p>{{ video.title }}
                        <span class="acts">
                            <el-button type="text">编辑</el-button>
                            <el-button type="text" @click="deleteVideo(video.id)">删除</el-button>
                        </span>
                    </p>
                </li>
            </ul>
        </li>
    </ul>
    <div>
        <el-button @click="previous">上一步</el-button>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
    </div>

    <!-- 添加和修改章节表单 -->
    <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
    <el-form :model="chapter" label-width="120px">
        <el-form-item label="章节标题">
            <el-input v-model="chapter.title"/>
        </el-form-item>
        <el-form-item label="章节排序">
            <el-input-number v-model="chapter.sort" :min="0" controls-position="right"/>
        </el-form-item>
    </el-form>
    <div slot="footer" class="dialog-footer">
        <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
        <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
    </div>
    </el-dialog>
    <!-- 添加和修改课时表单 -->
    <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
      <el-form :model="video" label-width="120px">
        <el-form-item label="课时标题">
          <el-input v-model="video.title"/>
        </el-form-item>
        <el-form-item label="课时排序">
          <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
        </el-form-item>
        <el-form-item label="是否免费">
          <el-radio-group v-model="video.free">
            <el-radio :label="true">免费</el-radio>
            <el-radio :label="false">默认</el-radio>
          </el-radio-group>
        </el-form-item>
        <el-form-item label="上传视频">
          <!-- TODO -->
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
        <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
      </div>
    </el-dialog>
  </div>
  
</template>
<script>
import chapter from '@/api/edu/chapter'
import video from '@/api/edu/video'

export default {
  data(){
    return {
      //保存按钮是否禁用
      saveBtnDisabled: false,
      chapterVideoList:[],
      courseId:'',
      chapter:{//封装数据
        title: '',
        sort: 0
      },
      video:{
        title: '',
        sort: 0,
        free: 0,
        videoSourceId: ''
      },
      dialogChapterFormVisible:false,//章节弹框
      dialogVideoFormVisible:false//小节弹框
    }
  },
  created(){
    if (this.$route.params && this.$route.params.id)
    {
      this.courseId = this.$route.params.id
      this.getAllChapterVideo()
    }
  },
  methods:{
//---------------------------小节操作------------------------------
    //删除小节
    deleteVideo(videoId){
      this.$confirm('此操作将永久删除小节记录, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
          }).then(() => {
            video.deleteVideo(videoId)
              .then(response => {
                //提示信息
                this.$message({
                  type: 'success',
                  message: '删除成功!'
                })
                //刷新页面
                this.getAllChapterVideo()
              })
          })
    },
    //添加小节弹框
    openVideo(chapterId){
      this.dialogVideoFormVisible = true
      //设置章节id
      this.video.chapterId = chapterId
      //清空数据
      this.video.title = ''
      this.video.sort = 0
      this.video.free = 0
      this.video.videoSourceId = ''
    },
    //添加小节
    addVideo(){
      this.video.courseId = this.courseId
      video.addVideo(this.video)
        .then(response => {
          //关闭弹框
          this.dialogVideoFormVisible = false
          //提示信息
          this.$message({
            type: 'success',
            message:"添加小节成功"
          })
          //刷新页面
          this.getAllChapterVideo()
        })
    },
    //修改小节

    saveOrUpdateVideo(){
      this.addVideo()
    },
//---------------------------章节操作------------------------------
    //删除章节
    deleteChapter(chapterId){
      this.$confirm('此操作将永久删除章节记录, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
          }).then(() => {
            chapter.deleteChapter(chapterId)
              .then(response => {
                //提示信息
                this.$message({
                  type: 'success',
                  message: '删除成功!'
                })
                //刷新页面
                this.getAllChapterVideo()
              })
          })
    },
    //修改章节数据回显
    openEditChapter(chapterId){
      this.dialogChapterFormVisible = true
      chapter.getChapter(chapterId)
        .then(response => {
          this.chapter = response.data.chapter
        })
    },
    //添加章节弹框
    openChapterDialog(){
      this.dialogChapterFormVisible = true
      //清空数据
      this.chapter.title = ''
      this.chapter.sort = 0
    },
    //添加章节
    addChapter(){
      //设置chapter中的courseid
      this.chapter.courseId = this.courseId
      chapter.addChapter(this.chapter)
        .then(response => {
          //关闭弹框
          this.dialogChapterFormVisible = false
          //提示信息
          this.$message({
            type: 'success',
            message:"添加章节成功"
          })
          //刷新页面
          this.getAllChapterVideo()
        })
    },
    //修改章节
    updateChapter(){
      chapter.updateChapter(this.chapter)
        .then(response => {
          //关闭弹框
          this.dialogChapterFormVisible = false
          //提示信息
          this.$message({
            type: 'success',
            message:"修改章节成功"
          })
          //刷新页面
          this.getAllChapterVideo()
        })
    },
    saveOrUpdate(){
      if (!this.chapter.id)
        {
            this.addChapter()
        }
        else
        {
            this.updateChapter()
        }
    },
    //返回章节列表
    getAllChapterVideo(){
      chapter.getChapterVideoList(this.courseId)
        .then(response => {
          this.chapterVideoList = response.data.chapterVideoList
        })
    },
    previous(){
      this.$router.push({path:'/course/info/'+this.courseId})
    },
    next(){
      this.$router.push({path:'/course/publish/'+this.courseId})
    }
  }
}
</script>
<style scoped>
.chanpterList{
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
}
.chanpterList li{
  position: relative;
}
.chanpterList p{
  float: left;
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%;
  border: 1px solid #DDD;
}
.chanpterList .acts {
    float: right;
    font-size: 14px;
}
.videoList{
  padding-left: 50px;
}
.videoList p{
  float: left;
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 1px dotted #DDD;
}
</style>